单项选择题

At that time, many readers (found) (it) difficult (believing) what Jules Verne had written in his book (to be true).

A．found
B．it
C．believing
D．to be
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单项选择题
(If) you (will buy) one box at the regular price, you would receive (another one) at (no) extra cost.
A．If
B．will buy
C．another
D．no
单项选择题
(Two-thirds) of (the) area (are) covered by (water).
A．Two-thirds
B．the
C．are
D．water
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